Tree House Mystery

Gertrude Chandler Warner

Cover of Tree House Mystery

Tree House Mystery

Age Rating, Reading Level & Content Guide

by Gertrude Chandler Warner

Illustrated by David Cunningham

Reading Level 4-5 9C Ages 9-12 Balanced Read

The text is written at a 4th grade reading level, the subject matter is intended for middle graders (ages 9–12), and the content is gentle with no concerning themes.

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About This Book

There’s a hidden window in the neighbor’s house that no one has ever seen before — but why? Four curious siblings decide to uncover the secret, and what they find is just the beginning of an amazing adventure full of mystery and surprises.

Quick Assessment

This middle-grade mystery follows four siblings who befriend new neighbors while uncovering a secret window in their house. The story encourages curiosity, problem-solving, and family bonding in a gentle and age-appropriate way, making it suitable for readers ages 9-12. Parents can expect light suspense without any intense or inappropriate content.

For Parents

Content Intensity

9C — Clear
Emotional
Clear
Physical
Clear
Social
Clear
Thematic
Clear

No conflict beyond everyday childhood experiences. Safe for sensitive readers.

Data confidence: standard

Was our "Gentle" content intensity rating accurate for this book?

Reading Insights

Hook Factor

3/10

A steady, thoughtful read that rewards patient readers.

Discussion Potential

1/10

A lighter read — great for independent enjoyment.

Book DNA

Multi-dimensional content fingerprint

Vocabulary Level
4
Emotional Weight
2
Theme Richness
4
World Scope
1
Data Confidence
7

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Details

Book Length

127 pages
ISBN
9780807580875
Pages
127
Publisher
Random House Books for Young Readers
Published
October 1990
Type
Fiction

Genres

Subjects

Mysteries, Espionage, & Detective StoriesMystery and Detective StoriesOrphansBoxcar ChildrenBrothers and SistersBrothers and Sisters in FictionOrphans in FictionFamiliesFamilyDetective and Mystery StoriesAlden FamilyMystery FictionChild DetectivesBrothersCastlesSiblings